US3585274A - Relief of dielectric stress in high voltage cable connections - Google Patents

Relief of dielectric stress in high voltage cable connections Download PDF

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Publication number
US3585274A
US3585274A US857940A US85794069A US3585274A US 3585274 A US3585274 A US 3585274A US 857940 A US857940 A US 857940A US 85794069 A US85794069 A US 85794069A US 3585274 A US3585274 A US 3585274A
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United States
Prior art keywords
high voltage
tube
voltage cable
housing
coaxially
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Expired - Lifetime
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US857940A
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English (en)
Inventor
Don R Tomaszewski
Gerald A Wyatt
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3M Co
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Minnesota Mining and Manufacturing Co
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Priority to US857940A priority Critical patent/US3585274A/en
Priority to CA109,144A priority patent/CA957033A/en
Priority to JP2311171A priority patent/JPS4733280A/ja
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
    • H02G15/103—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures
    • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress

Definitions

  • Dielectric stress control at high voltage cable terminations is achieved by surrounding the high stress areas of a high voltage cable with a tube composed of high permittivity homogeneous material including one or more titanates and/or titanium dioxide which tube makes contact at one end with a ground electrode contacting the shielding of the high voltage cable.
  • the tube also makes contact at the other end with a high voltage electrode making 7 contact with the conductor of the high voltage cable.
  • This invention relates to high voltage electrical power transmission and' distribution and has particular reference to dielectric stress control at high voltage cable terminations.
  • This invention is specifically related to the type of high voltage cable termination wherein a shielded high voltage cable is terminated with the shielding of the cable in contact with a ground electrode.
  • the present invention provides improved means for relieving dielectric stress relief medium a tube of high permittivity homogeneous material including one or more titanates and/or titanium dioxide, inposition for surrounding a high voltage cable and with one end in coaxial contact with a ground electrode in order .to provide a more uniform electric field gradient in and outside of the exposed insulation of the high voltage cable.
  • a tube of high permittivity homogeneous material including one or more titanates and/or titanium dioxide
  • the geometry of the tube is relatively smooth.
  • Relatively smooth geometry is defined as the type of geometry shown in the various embodiments of the present inventiondescribed and illustrated herein as contrasted with the irregular geometry of the stress relief medium described in the above-referenced Nicholas patent.
  • the present invention in one preferred embodiment, provides that the thickness of the tube be greatest at the region of contact of the .tube with the ground electrode, and be decreased along the length of the tube away from the ground electrode, thereby providing decreased nonlinearity in the voltage distribution.
  • the present invention in another preferred embodiment, provides that the tube at its other end coaxially contact a high voltage electrode positioned for coaxially contacting the conductor of the -.high voltage cable.
  • This embodiment is preferably employed for applications wherein the rating of the high voltage termination is about l5 Kilovolts or higher.
  • the permittivity of the tube in this embodiment is about at least 50 to 100 times the permittivity of the insulation of the high voltage cable, the minimum being dependent upon the thickness of the tube and the voltage rating of the device to which the high voltage cable is to be connected. While this embodiment is operable with a tube permittivity of about 50, a tube permittivity of at least 200 is preferred. This embodiment is particularly advantageous in combating the arcing effect caused by a combination of rain and the salts of air pollution which settle on exposed high voltage terminals.
  • the present invention in an alternate preferred embodiment provides that the tube coaxially contact only the ground electrode.
  • This embodiment is preferably employed for applications wherein the rating of the high voltage termination is about 35 Kilovolts or less.
  • the permittivity of the tube in this embodiment is about at least five to times-the permittivity of the insulation of the high voltage cable. Again, this minimum is dependent upon the thickness of the tube and the voltage rating of the device to'which the high voltage cable is to be connected. While this embodiment is operable with a tube permittivity of about 15, a tube permittivity of at least 30 is preferred This embodiment is also preferred in those ap'pli cations wherein the economic requirements make it necessary to use a tube having a smaller quantity of material.
  • a tube material havinga permittivity in this lower range is preferred because a tube material having a higher'p'ermittivity would provide greater concentration of the flux lines in the insulation adjacent the exposed end of the tube, thereby making the insulation more susceptible to overloading.
  • the present invention in a further embodiment, provides that the tube be comprised of a plurality of annular segments having conductive end coatings, thereby facilitating the manufacture of tubes of particularly large dimension.
  • the present invention in still another embodiment, provides means for relievingdielectric stress at'asplice of a plurality of shielded and insulated high voltage cables.
  • a housing is provided having both a ground electrode which is positioned ina housingfor coaxially contacting the shielding of each high voltage cable at the splice and a high voltage'electrode positioned in the housing for coaxially contacting the conductor of each high' voltage cable thereat.
  • Tubes'provided in accordance with the present invention are positioned for surrounding'an exposed portion of the insulation of each of thehigh voltage cables at the splice.
  • each tube coaxially contacts both the ground electrode and the high voltage electrode; each tube surrounding the exposed insulation of a given cable coaxially contacts only a given one of these two electrodes; and two tubes are provided to surround the exposed insulationof each high voltage cable wherein each tube coaxially contacts one of the electrodes-but do not contact each other.
  • the present invention is readily adaptable for other applications, wherein it is necessary to provide-a uniform voltage distribution between a source of high voltage potential and a source of ground voltage potential.
  • an insulator constructed in accordance with the present invention would be useful in uniformly distributing the voltage between the high voltage conductor of a transmission line and the ground electrode of a transmission tower.
  • FIGS. land 2 The performance of the means of the present invention is graphically illustrated in FIGS. land 2.
  • a'graph has been prepared showing the voltage distribution along the surface of an exposed insulation at the termination of a high voltage cable. Plots are shown for a condition of no stress relief, wherein the permittivity, K", equals 1, and for various values of permittivity ranging from 50 a to l,800 for a tube constructed in accordance with the present invention.
  • the plots were made by means of an analog of a termination of the type shown in FIGS. 3 and 4, which are rated at a line to line voltage of 15 Kilovolts. There is alsoshown in the graph of FIG. 1
  • FIG. 2b illustrates the relativelyuniform stress relief which is provided by the means of the present invention.
  • an analog of means constructed as illustrated in FIG. 3 was used in obtaining this plot.
  • the tube material represented in obtaining this plot was largely composed of barium titanate.
  • the tube had a permittivity of about 600.
  • FIG. 1 is a graph showing the voltage distribution along the surface of an exposed insulation at the termination of a high voltage cable using stress control means of the type shown in FIGS. 3 and 4 but with dielectric stress relief media having different permittivities. Curves showing an idealized linear voltage distribution and a voltage distribution wherein no dielectric stress relief medium is provided are also illustrated.
  • FIG. 2a is an analog plot showing the electric field in the locality of an exposed insulation at the termination of a high voltage cable without the use of any dielectric stress relief medium.
  • FIG. 2b is an' analog plot showing the electric field in the locality of an exposed insulation at the termination of a high voltage cable using dielectric stress control means of the type shown in FIG. 3 wherein the dielectric stress relief medium has a permittivity of about 600.
  • the scale of FIG. 2b is onetenth that of FIG. 20.
  • FIG. 3 shows a preferred embodiment of means for providing dielectric stress control at the termination of a high voltage cable.
  • FIG. 4 shows an alternative preferred embodiment of the dielectric stress control means shown in FIG. 3, wherein the dielectric stress relief medium is of different dimensions and placement.
  • FIG. 5 shows a preferred embodiment of means for providing dielectric stress control at a splice of a plurality of high voltage cables.
  • FIG. 6 shows a segment of a tubular dielectric stress control medium such as that shown in FIGS. 3 to 5.
  • FIGS. 70, 7b and 70 show alternative preferred embodiments of a tubular dielectric stress control medium such as that shown in FIGS. 3 to 5.
  • FIGS. 3 through 7 DESCRIPTION OF THE PREFERRED EMBODIMENT Various preferred embodiments of the present invention are illustrated in FIGS. 3 through 7. These views of these embodiments are not drawn to scale but are illustrative of their general configurations. The pertinent dimensions will be further discussed hereinafter.
  • FIG. 3 there is shown a preferred embodiment of the present invention wherein the tubular stress relief medium 12 fully extendsfrom the ground electrode 14 to the high voltage electrode 16.
  • the tube 12, ground electrode 14 and high voltage electrode 16 all have flat surfaces at their respective regions of contact with each other.
  • the ends of the tube 12 are coated with conductive material such as silver to improve contact with the electrodes 14 and 16.
  • the dielectric stress control means 18 is shown in combination with a shielded and insulated high voltage cable 20.
  • the conductor 22 of the cable is coaxially contacted by the high voltage electrode 16.
  • the shielding 24 is coaxially contacted by the ground electrode 14. In the region between the ground electrode l4 and the high voltage electrode 16, an exposed portion of the insulation 26 is surrounded by the tube 12.
  • An insulating dielectric filler 28 such as an elastomer is provided between the tube 12 and the insulation 26 and between the tube 12 and the porcelain housing 30.
  • a conductive glaze 32 is provided on the ground end of the housing.
  • the conductive glaze 32, the ground electrode 14, the shielding 24 and the mounting bracket 34 are each grounded to assure a uniformly grounded voltage potential at the ground electrode end of the housing 30.
  • the high voltage electrode 16 contains a threaded aperture 36 through which a screw may be inserted for securing a conductor 22 to the high voltage electrode 16.
  • the high voltage electrode also contains a conductor aperture 38 and a threaded aperture 40 for facilitating the connection of an outside conductor to the high voltage electrode 16.
  • the tube 12- is prefe rably a ceramic. material such as a homogeneous composition consisting of at least a major proportion of barium titanate. Ceramic structures of high permittivity are well known in the art, as seen, for example, in U.S. Pat. Nos. 2,429,588 and 2,626,220. A wide range of permittivity values is possible, but where high voltage and minimum space are important, a barium titanate ceramic having a permittivity of at least about 600 is preferred.
  • the insulating dielectric filler 28 may be a viscous fluid dielectric, such as silicone grease, or solid or elastomeric dielectrics, such as silicone gums, phenol-aldehyde or other resins.
  • the solid or elastomeric dielectrics provide a better support for the tube 12.
  • the tube may also be supported by compressive force elements, such as compression springs (not shown), or by mechanical means such as clamps (notshown).
  • the dimensions of the tube 12 and also those of thetermination 18 are dependent upon the voltage rating of the termination 18.
  • the length must'also be sufficient to prevent flashover around the porcelain housing 30.
  • the tube is about 6.5 inches (approximately 16.3 centimeters) in length.
  • the inside diameter is 1.0 inch (approximately 2.5 centimeters) and the tube wall thickness is about 0.
  • the ground electrode 14 and high voltage electrode 16 are made of a good conductor such as copper or brass.
  • the analog plot shown in FIG. 2b was prepared using representation of a termination having the foregoing dimensions and with a high voltage cable composed of a No. 2 gauge stranded copper conductor, covered by 0.175 inch (approximately 4.4 millimeters) thick insulation with a permittivity of 2.5 and a metal shielding inserted therein.
  • the dielectric insulating filler was rubber with a permittivity of 2.5.
  • a tube largely composed of barium titanate and having a permittivity of about 600 was used.
  • the embodiment shown in FIG. 3 is preferred for 15 kv. applications when the permittivity of the tube is generally greater than 100
  • the embodiment shown in FIG. 4 is preferred for 15 kv. applications when the permittivity of the tube is less than 100.
  • the tube 42 of the FIG. 4 embodiment does not extend to and contact the high voltage electrode 16, whereas the tube 12 of the FIG. 3 embodiment does.
  • tubes of high permittivity are used.
  • the tube may be an artificial dielectric such as is described in U.S. Pat. No. 3,287,489 or such as is described by the following formula.
  • a fluorocarbon elastomer comprising a copolymer of hexafluoropropylene and vinylidene fluoride.
  • Dielectric Strength 400 volts per mil
  • the housing 44 is shown with two high voltage cables 46 and 48 inserted therein.
  • the ground electrode 50 extends throughout the housing 44 and coaxially contacts the shieldings 52 and 54 of the cables 46 and 48 respectively.
  • the high voltage electrode 56 coaxially contacts the conductors 58 and 60 of the respective cables 46 and 48.
  • tubes surrounding an exposed portion of the cable insulation would normally be of the same dimensions, tubes of different dimenh sions are shown in the embodiment of FIG. 5.
  • the tube 62 which surrounds an exposed portion of the insulation 64 of the cable 46 coaxially contacts both the ground electrode 50 and the high voltage electrode 56.
  • only the tube 68 which coaxially contacts the high voltage electrode 56 is included. This embodiment is preferred in applications wherein dielectric stress control is needed only at the high voltage electrode end of the insulation'due .to use of geometrical stress control at ground electrode.
  • only the tube 70 which coaxially contacts the ground electrode 50 is included. This embodiment is preferred in applications wherein stress concentrations at the high voltage are insufficient to cause breakdown or are otherwise controlled.
  • the high voltage electrode may consist of two portions 72 and 74 of conductive material, exterior shield socket, and interior connectors, respectively. Alternately a single interior connector with exterior shield may be used.
  • the conductors 58 and 60 aresecured in the interior connector portion 74.
  • this splice embodiment is constructed of the same materials described for the embodimentshown in FIG. 3.
  • construction methods are such that it is more economical and reliable to provide a tube composed of a plurality of segments such as shown in FIG. 6, wherein the ends of each tube are coated with conductive material 76, such as silver.
  • the tube segments are composed of the same type of high permittivity homogeneous material 78 as is used in the single segment tube embodiments.
  • the conductive coating 76 is only about 0.001 inch (approximately 0.03 millimeter) thick and as a result does not substantially affect the electric field at the termination.
  • the ground electrode consists solely of the coating of conductive material on one end of the tube.
  • the cable shielding coaxially contacts this conductive coating.
  • each segment is about 3 inches (approximately 17.6 centimeters) in length, about 4.25 inches (approximately 10.6 centimeters) in outside diameter and about 0.5 inch (approximately 1.3 centimeters) thick.
  • the segments largely consist of barium titanate and have a permittivity of about 635. Otherwise this 69 kv. embodiment generally has the configuration shown in FIG. 3, except for those alterations which are well known to those skilled in this art.
  • Such alterations include the provision of conductive retaining caps over the exposed ends of the ground electrode and the high voltage electrode and the enclosure of the entire structure within a support tube having an outside diameter of about 5.5 inches (approximately 13.8 centimeters), supported by the two electrodes, and filled with silicone oil. Spring contact between the adjacent segments is maintained by means of intervening radially fluted annular spring members of 0.02 inch (approximately 0.5 millimeter) spring bronze plate, which is thin enough not to affect the electric field at the termination.
  • This termination is used with a stranded cable conductor having a diameter of about 0.875 inch (approximately 2.2 centimeters) which is covered by an insulating covering having a 2.5 inch (approximately 6.3 centimeters) diameter and an outer 0.0625 inch (approximately 1.6 millimeters) thick grounded shield.
  • This cable is encased within a plastic jacket to give it a total diameter of about 2.625 inches (approximately 6.5 centimeters).
  • the cable shielding is terminated a distance of about 25.5 inches (approximately 63.8 centimeters) from the end of the conductor.
  • the cable insulation terminates in a conical configuration extending to within 2.25 (approximately 5.6 centimeters) from the end of the conductor and fits tightly within a conical depression in the high voltage electrode into which the end of the conductor is tightly sealed with rubber elastomer.
  • the tubes shown in FIG. 7 are not drawn to scale. In all three tubes, the inside diameter is relatively constant, although this is not essential and should not be construed as a limiting feature.
  • the outside diameter of the tube decreases linearly along its length away from the ground electrode end 80.
  • FIG. 7b the outside diameter of the tube decreases nonlinearly along its length away from the ground electrode end 82 with the rate of decrease decreasing with increased distance away from the ground electrode end 82.
  • the tube consists of segments 84, 86, 88, 90, 92.
  • the overall outside diameter is decreased at a decreasing rate along its length away from the ground electrode end 94 as in the embodiment of FIG. 7b, except that segments 84 and 86are of the same thickness.
  • the decrease in thickness in each of the segments 88, 90, 92, however, is linear.
  • the slope of the voltage distribution curve (such as those shown in FIG. 1) is decreased in the region immediate to the ground electrode. This decreases the nonlinearity of the voltage distribution without necessarily having to increase the permittivity of the dielectric stress relief medium.
  • Means for relieving dielectric stress at a termination of a shielded and insulated high voltage cable comprising a housing defining a hollow section for receiving said high voltage cable;
  • a ground electrode positioned in the housing for coaxially contacting the shielding of said high voltage cable
  • a tube of high permittivity homogeneous material having relatively smooth geometry positioned in the housing with one end of the tube coaxially contacting the ground electrode for surrounding an exposed portion of the insulation of said high voltage cable,
  • homogeneous material substantially includes one or more titanates and/or titanium dioxide.
  • Means for relieving dielectric stress at a termination of a shielded and insulated high voltage cable according to claim 1, further comprising a high voltage electrode positioned in the housing for coaxially contacting the conductor of said high voltage cable;
  • Means for relieving dielectric stress at a termination of a shielded and insulated high voltage cable comprising a housing defining a hollow section for receiving a said high voltage cable;
  • a ground electrode positioned in the housing for coaxially contacting the shielding of a said high voltage cable
  • a tube of high permittivity homogeneous material positioned in the housing for surrounding an exposed portion of the insulation of a said high voltage cable, wherein one 7 end of the tubecoaxially contacts the ground electrode,
  • the geometry of the tube is relatively smooth. and wherein the tube comprises a plurality of annular seg ments having conductive end coatings,
  • Means for relieving dielectric stress at a termination of a shielded and insulated high voltage cable comprising a housing defining a hollow section for receiving a said high voltage cable;
  • a ground electrode positioned in the housing for coaxially contacting the shielding of a said high voltage cable; and tube of high permittivity homogeneous material positioned in the housing for surrounding an exposed portion of the insulation of a said high voltage cable, wherein one end of the tube coaxially contacts the ground electrode, wherein the geometry of the tube is relatively smooth, and wherein the tube is isolated from contact with the conductor of a said high voltage cable and wherein the permittivity of the tube is at least 15.
  • Means for relieving dielectric stress at a termination of a shielded and insulated high voltage cable comprising a housing defining a hollow section for receiving a said high voltage cable;
  • a ground electrode positioned in the housing for coaxially contacting the shielding of a said high voltage cable
  • a high voltage electrode positioned in the housing for coaxially contacting the conductor of a said high voltage cable
  • a tube of high permittivity homogeneous material positioned in the housing for surrounding an exposed portion of the tube coaxially contacts the ground electrode, wherein the geometry of the tube is relatively smooth, wherein the other end of the tube coaxially contacts the high voltage electrode, and wherein the permittivity of the tube is at least 50 to 100 times the permittivity of the insulation of a said high voltage cable, the minimum being dependent upon the thickness and the length of the tube.
  • Means for relieving dielectric stress at a termination of a shielded and insulated high voltage cable comprising a housing defining a hollow section for receiving a said high voltage cable;
  • a ground electrode positioned in the housing for coaxially contacting the shielding of a said high voltage cable
  • a high voltage electrode positioned in the housing for coaxially contacting the conductor of a said high voltage cable
  • a tube of high permittivity homogeneous material positioned in the housing for surrounding an exposed portion of the insulation of a said high voltage cable, wherein one end of the tube coaxially contacts the ground electrode, wherein the geometry of the tube is relatively smooth, wherein the other end of the tube coaxially contacts the high voltage electrode, and wherein the permittivity of the tube is at least 50.
  • Means for relieving dielectric stress at a splice of a plurality of shielded and insulated high voltage cables comprising 'a housing defining hollow sections for receiving each said high voltage cable;
  • a high voltage electrode positioned in the housing for coaxially contacting the conductor of each said high voltage cable
  • each tube coaxially contacts at least one of the electrodes, which homogeneous material substantially includes one or more titanates and/or titanium dioxide.
  • Means for relieving dielectric stress at a splice of a plurality of shielded and insulated high voltage cables comprising a housing defining hollow sections for receiving each said high voltage cable;
  • a ground electrode positioned in the housing for coaxially contacting the shielding of each said high voltage cable
  • each tube coaxially contacts at least one of the electrodes, wherein the geometry of each tube is relatively smooth, and wherein the number of tubes is double the number of hollow sections, wherein each tube coaxially contacts one of the electrodes, and wherein the two tubes in each hollow section are isolate from each other i 11.
  • I a ground electrode a high voltage electrode positioned in the housing for contacting a said high voltage conductor
  • homogeneous high permittivity material having a relatively smooth geometry and positioned in the housing and contacting both the high voltage electrode and the ground electrode, which homogeneous material substantially includes one or more titanates and/or titanium dioxide.
  • Means for relieving dielectric stress at a splice of a plurality of shielded and insulated high voltage cables comprising a housing defining hollow sections for receiving each said high voltage cable; a ground electrode for coaxially contacting the shielding of each said high voltage cable;
  • a high voltage electrode positioned in the housing for coaxially contacting the conductor of each said high voltage cable
  • each tube coaxially contacts at least one of the electrodes
  • each tube is at least l5.
  • each tube coaxially contacts the ground electrode and the other end of each tube coaxially contacts the high voltage electrode
  • each tube is at least 5O.
  • Means for relieving dielectric stress ata splice of a plurality of shielded and insulated high voltage cables comprising a housing defining hollow sections for receiving each said high voltage cable;
  • a high voltage electrode positioned in the housing for coaxially contacting the conductor of each said high voltage cable
  • each tube coaxially contacts at least one of the electrodes
  • each tube comprises a plurality of annular segments having conductive end coatings.

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US857940A 1969-09-15 1969-09-15 Relief of dielectric stress in high voltage cable connections Expired - Lifetime US3585274A (en)

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US857940A US3585274A (en) 1969-09-15 1969-09-15 Relief of dielectric stress in high voltage cable connections
CA109,144A CA957033A (en) 1969-09-15 1971-03-30 Relief of dielectric stress in high voltage cable connections
JP2311171A JPS4733280A (ja) 1969-09-15 1971-04-15

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796821A (en) * 1972-10-06 1974-03-12 G & W Electric Speciality Co High voltage cable termination
US3828115A (en) * 1973-07-27 1974-08-06 Kerite Co High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof
DE2413475A1 (de) * 1973-03-20 1975-01-02 Raychem Ltd Polymerenmassen fuer elektrische verwendungszwecke
US4053702A (en) * 1975-07-14 1977-10-11 Minnesota Mining And Manufacturing Company Dielectric stress relief at a high voltage cable termination
FR2425707A1 (fr) * 1978-05-12 1979-12-07 Minnesota Mining & Mfg Materiau dielectrique pour influencer les champs electriques et dispositifs de limitation et l'effort dielectrique constitues d'un tel materiau
DE2903255A1 (de) * 1978-11-21 1980-05-22 Trefimetaux Isolierende armatur aus einem elastomer-formteil zum schuetzen der enden von elektrischen kabeln
FR2456410A1 (fr) * 1979-05-11 1980-12-05 Electricite Radio Aviat Meca Perfectionnements aux dispositifs de protection pour extremites de cables electriques a moyenne tension
US4517407A (en) * 1982-09-21 1985-05-14 G & W Electric Company High voltage cable terminator and method of assembly
US4714800A (en) * 1983-12-13 1987-12-22 Raychem Corporation Stress control/insulating composite article with an outer surface having convolutions and electric power cable terminated therewith
DE3906553A1 (de) * 1989-03-02 1990-09-06 Asea Brown Boveri Abschirmelektrode
DE4007335A1 (de) * 1990-03-08 1991-09-12 Asea Brown Boveri Elektrischer isolator
WO1995031845A1 (en) * 1994-05-18 1995-11-23 Minnesota Mining And Manufacturing Company Cylindrical radially shrinkable sleeve for an electrical cable and composition thereof
DE19500849A1 (de) * 1995-01-13 1996-07-18 Abb Research Ltd Elektrisches Bauteil
EP0780949A1 (en) * 1995-12-23 1997-06-25 Minnesota Mining And Manufacturing Company Universal cable adapter, cable joint using the adapter and method of making the same
US5756936A (en) * 1994-05-18 1998-05-26 Minnesota Mining And Manufacturing Company Cylindrical radially shrinkable sleeve for an electrical cable and composition thereof
US20090153286A1 (en) * 2007-12-14 2009-06-18 Maclean-Fogg Company Insulator for cutout switch and fuse assembly
US9870848B2 (en) 2016-04-22 2018-01-16 Te Connectivity Corporation Multiple stress control device for cable accessories and methods and systems including same
EP3705515A1 (en) 2019-03-08 2020-09-09 Tyco Electronics UK Ltd. Elastomeric material

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Publication number Priority date Publication date Assignee Title
JPS605724A (ja) * 1983-06-22 1985-01-12 株式会社フジクラ 紙絶縁電力ケ−ブルの接続部
JPS6020718A (ja) * 1983-07-09 1985-02-02 株式会社フジクラ ゴム・プラスチツクケ−ブルの接続部
JPS6020717A (ja) * 1983-07-09 1985-02-02 株式会社フジクラ プレモールドゴムストレスコーン
JP4495514B2 (ja) * 2004-05-13 2010-07-07 昭和電線ケーブルシステム株式会社 ケーブル終端部
FR2883425B1 (fr) * 2005-03-21 2007-05-04 Nexans Sa Extremite synthetique de cable electrique pour tension continue

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US2174377A (en) * 1934-09-22 1939-09-26 Enfield Cable Works Ltd Termination and joint for electric cables
US2386185A (en) * 1943-07-12 1945-10-09 Glover & Co Ltd W T High voltage electric cable termination and joint
CH325259A (de) * 1954-05-08 1957-10-31 Brugg Ag Kabelwerke Sperrmuffe in Ölkabeln

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Publication number Priority date Publication date Assignee Title
US1723846A (en) * 1925-03-10 1929-08-06 Gen Electric Insulated cable joint
US2174377A (en) * 1934-09-22 1939-09-26 Enfield Cable Works Ltd Termination and joint for electric cables
US2386185A (en) * 1943-07-12 1945-10-09 Glover & Co Ltd W T High voltage electric cable termination and joint
CH325259A (de) * 1954-05-08 1957-10-31 Brugg Ag Kabelwerke Sperrmuffe in Ölkabeln

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796821A (en) * 1972-10-06 1974-03-12 G & W Electric Speciality Co High voltage cable termination
DE2413475A1 (de) * 1973-03-20 1975-01-02 Raychem Ltd Polymerenmassen fuer elektrische verwendungszwecke
US3828115A (en) * 1973-07-27 1974-08-06 Kerite Co High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof
US4053702A (en) * 1975-07-14 1977-10-11 Minnesota Mining And Manufacturing Company Dielectric stress relief at a high voltage cable termination
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Publication number Publication date
JPS4733280A (ja) 1972-11-17
CA957033A (en) 1974-10-29

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